190 Miller Mammals from Lankawi <ni<l Butano Islands. 



Mus surifer butangensis subsp. nov. 



Type. Adult male (skin and skull) No. 104,309 United Stales National 

 .Museum. Collected on Pulo Adang, Butang Islands, December 10. ISiM). 

 Original number 157. 



Characters. More robust than Mus xurifcr xiirifer from Trong, Lower 

 Siam; tail distinctly shorler than head and body: ground color of sides 

 and upper parts darker and less bright than in the mainland form, and 

 dark shading more diffuse; belly dirty buff; skull with the rostrum 

 deeper, the braincase relatively narrower and more ridded, and the in- 

 terparietal more distinctly triangular in outline. 



Color. The color differs from that of the typical race in the dullness 

 of the fulvous tints. These are very nearly ochraceous-buff in marked 

 contrast with the orange-buff of Mm surifer surifer and M. * u rffer fl<i rid- 

 ult.i*. The sprinkling of blackish hairs in very diffuse, adding to the 

 peculiar aspect of the animal. Underparts soiled cream-buff. Tail and 

 feet as in the related forms. 



Skull and teeth. The skull, while not actually larger than in the main 

 land race is more angular and heavily ridged. The rostrum when 

 viewed from the side is distinctly deeper and the braincase appears to be 

 slightly narrower, though the latter character is not very well marked. 

 The outline of the interparietal is nearly a perfect isosceles triangle the 

 base of which (the anterior edge) is about one and one half times as long 

 as either side. Teeth as in typical Mus surifer. 



Measurements. External measurements of type: total length, 374; 

 head and body, 203; tail vertebras, 171; hind foot, 43; hind foot without 

 claws, 41. Average of twelve specimens from the type locality: total 

 length, 353 (311-381); head and body, 194 (178-210); tail vertebra 1 , 159 

 (133-171); hind foot, 41 (38.5-43); hind foot without claws, 38 (37-41). 

 Average of three specimens from Pulo Rawi; total length, 353 (330-350); 

 head and body, 192 (184-203); tail vertebrae, 100 (152-105); hind foot, H9 

 (38.5-40); hind foot without claws, 30.8 (30.5-37). 



Specimens examined. Fifteen; twelve from Pulo Adang, and three 

 from Pulo Rawi, Butang Islands. 



Remarks. The three skins from Pulo Rawi agree very closely with 

 those from the type locality though in color they are slightly less dull. 



Mus pannosus sp. nov. 



Type. Adult male No. 104,110 United States National Museum. 

 Collected on Pulo Adang, Butang Islands, December 14, 1899. Original 

 number 146. 



Characters. Similar to Mus tambelanicus Miller, but with larger ears, 

 pelage of upper parts less suffused with red, and entire underparts griz 

 zled with gray. Audital bullas larger than in Mus tambelanicus. 



Color. Back a rather coarse grizzle of light wood-brown and blackish 

 brown the two colors mixed in nearly equal proportions. Sides very 



